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The GT-38 wireless serial communication module is a new generation of multi-channel embedded wireless data transmission module. The wireless working frequency band is 433-458.5MHz, and multiple channels can be set. The stepping speed is 100KHz, and there are 255 channels in total. The module's maximum transmit power is 100mW (20dBm), the receiving sensitivity is -116dBm at 5000bps air baud rate, and the open distance can reach 1200m communication distance. The module adopts stamp hole encapsulation and can be patch-welded. The module size is 26.7mm×12.9mm×6mm (including antenna cap, including spring antenna), which is convenient for customers to embed in the application system. The module has a PCB antenna holder ANT1. The user can use the 433M frequency band external antenna through the coaxial line. The module also has an antenna welding hole ANT2, which is convenient for the user to solder the spring antenna. The user can select one of the antennas according to the requirements of use. The module contains MCU inside, the user does not need to program the module separately, and various transparent transmission modes can only send and receive serial port data, which is convenient to use. The module adopts a variety of serial port transparent transmission modes, and the user can select with AT commands according to the usage requirements. Four modes FU1, FU2, FU3, and FU4 have an average operating current of 3.6mA, 80μA, 16mA, and 16mA in idle state, and the maximum operating current is 100mA (at full power emission state).